미세절개백내장수술에서 투명각막절개창의 위치에 따른 난시 변화 분석

황웅주,변용수,주천기.Woong-Joo Whang. MD. Yong-Soo Byun. MD. Choun-Ki Joo. MD. PhD 대한안과학회 2011 대한안과학회지 Vol.52 No.1

Purpose: To determine if a difference exists in surgically-induced astigmatism (SIA) and the mean change in keratometric astigmatism in patients who underwent microcoaxial cataract surgery (MCCS). Methods: A prospective study including 193 eyes with astigmatism of greater than 0.5 diopters was performed. The eyes were randomized into two groups: (1) 95 eyes with steep axis incision, and (2) 98 eyes with temporal incision. A 2.2-mm microcoaxial phacoemulsification was performed. The UCVA, BCVA and corneal topography (Orbscan II, Bausch & Lomb) were measured preoperatively and three months postoperatively. Surgically induced astigmatism was calculated via vector analysis, and the mean change in keratometric astigmatism was also calculated. Results: There were no significant differences in UCVA or BCVA between the two groups three months postoperative. The mean SIA was 0.45 ± 0.27 diopters in the steep axis incision group and 0.30 ± 0.17 diopters in the temporal incision group. In the steep axis incision group, the mean keratometric astigmatism showed a mean reduction of 0.31 ± 0.37 diopter (WTR: 0.37 D; oblique: 0.35D; ATR: 0.16 D), while the mean keratometric astigmatism showed a mean increase of 0.06 ± 0.29 diopters (WTR: 0.15 D increased; oblique: 0.11 D increased; ATR: 0.13 D reduced) in the temporal incision group. There were statistically significant differences in SIA and change in astigmatism between the two groups (p = 0.002, p = 0.000). Conclusions: In MCCS, steep axis incision achieved superior astigmatism correction in patients having with-the-rule or oblique astigmatism of greater than 0.5 diopters. J Korean Ophthalmol Soc 2011;52(1):29-33

Zernike 다항식을 통한 수차와 콘택트렌즈

황웅주(Woong-Joo Whang) 대한검안학회 2021 Annals of optometry and contact lens Vol.20 No.2

Aberration refers to a phase difference in light caused by a variation in the refractive power. Zernike polynomials, the most widely used method for analyzing aberrations in the human eye, consist of various polynomials configured according to the radial order and angular frequency. Among them, aberrations with an angular frequency of zero are suppressed by pupil and retinal sensitivity. Contact lenses for correcting presbyopia have mechanisms that induce vertical coma or spherical aberration. Positive spherical aberration is induced after wearing Ortho-k lenses.

백내장 수술 시 3가지 각막 곡률 검사기의 비교

황웅주(Woong-Joo Whang),주천기(Choun-Ki Joo) 대한검안학회 2012 Annals of optometry and contact lens Vol.11 No.1

목적: 수동 각막 곡률 검사기와 IOLMaster 자동 각막 곡률 검사기, Pentacam을 통해 측정된 각막 곡률값을 비교하고, 백내장 수술 시에 효용성이 있는 기구를 찾고자 하였다. 대상과 방법: 백내장 수술을 시행한 71안(71명)을 대상으로, 술 전 수동 각막 곡률 검사기와 IOLMaster, Pentacam (true net power)을 통해 각막 곡률을 측정하고, 비교하였다. 술 후 3개월에 굴절값을 측정하여, 예측 오차와 예측 오차의 절대값을 비교하였다. 안축장의 길이 측정에는 IOLMaster를 이용하였으며, 예측값 계산에는 A-상수를 후향적으로 보정한 SRK-T공식을 사용하였다. 결과: 수동 각막 곡률 검사기와 IOLMaster, Pentacam true net power상의 각막 곡률은 43.93±1.39, 44.02±1.40, 42.93±1.43D였다. 예측 오차는 0.000±0.53, 0.000±0.51D, 0.000±0.57D였으며, 예측 오차의 절대값은 0.43±0.31, 0.42±0.29, 0.47±0.33D였다. 결론: IOLMaster 자동 각막 곡률 검사기를 통해 측정한 각막 곡률이 백내장 수술 시 상대적으로 유용했다. Purpose: To compare keratometric values obtained with a manual keratometer, the IOLMaster automated keratometer (Carl Zeiss), and the Pentacam rotating Scheimpflug camera (Oculus) in cataract surgery, and to characterize the refractive outcomes generated using each device. Methods: In this retrospective study, 71 eyes of 71 patients were analyzed. The keratometric values obtained with different devices (manual keratometer, the IOLMaster automated keratometer and Pentacam scheimpflug camera) were employed for IOL power calculation. Axial length was measured by the IOLMaster partial coherence interferometry. The predicted refraction was evaluated using the SRK-T formula and optimization was conducted. Multiple comparisons of averaged corneal powers were conducted and the averaged corneal power was used to calculate the predicted refraction. The absolute values of corneal astigmatism were calculated using the corneal powers for the flat and steep meridians ([Ks-Kf]), and those were also compared. After cataract surgery, mean errors and mean absolute errors were compared. Results: The mean keratometric values generated by manual keratometer, the IOLMaster automated keratometer, and the Pentacam Scheimpflug system (true net power) were 43.93±1.39, 44.02±1.40 and 42.93±1.43 diopter. The standard deviation of the mean errors from manual keratometer, IOLMaster optical biometer and Pentacam Scheimpflug system were 0.53D, 0.51D and 0.57D. The mean absolute values from manual keratometer, IOLMaster optical biometer and the Pentacam Scheimpflug system were 0.43±0.31, 0.42±0.29 and 0.47±0.33 diopter. Conclusions: Corneal power measurements with the IOLMaster optical biometer are a good choice for application to cataract surgery.

CNT 전도성 필름이 코팅된 PET (polyethylene terephthalate) 박막의 전기-기계적 특성에 관한 연구

황웅주(Ung-Ju Hwang),김재현(Jae-Hyun Kim),황보윤(Yun Hwang bo),이학주(Hak-Joo Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.4

아스퍼질루스균에 의한 내인성 안내염 환자에서 뇌 기저 동맥 감염 동맥류가 동반된 증례

이미연,황웅주,이원기,Mee Yon Lee,Woong Joo Whang,Won Ki Lee 대한안과학회 2010 대한안과학회지 Vol.51 No.12

Purpose: To report a case of mycotic aneurysm of the cerebral basilar artery associated with bilateral endogenous aspergillus endophthalmitis. Case summary: A 41-year-old man with no underlying disease presented with decreased vision in both eyes. The patient was diagnosed with bilateral endogenous endophthalmitis, and the authors performed a vitrectomy and lensectomy on the right eye. Hyphae were detected in the vitreous sample, and systemic amphotericin was administered. Three days after the operation, the patient became comatose due to a subarachnoid hemorrhage. Aspergillus antigen was detected in the vitreous sample and in the cerebrospinal fluid. Subarachnoid hemorrhage was due to the rupture of a mycotic aneurysm of the cranial basilar artery, complicated by aspergillus infection of the central nervous system. J Korean Ophthalmol Soc 2010;51(12):1671-1675

펨토초라식과 에피라식의 단기 임상결과 비교

김성일,황웅주,변용수,송지혜,나경선,주천기.Sung Il Kim. MD. Woong-Joo Whang. MD. Yong Soo Byun. MD. Ji Hye Song. MD. Kyung Sun Na. MD. Choun-Ki Joo. MD 대한안과학회 2010 대한안과학회지 Vol.51 No.12

Purpose: To compare short-term clinical results of femtosecond LASIK with those of epi-LASIK. Methods: Twenty subjects (40 eyes) underwent femtosecond LASIK and 20 subjects (40 eyes) underwent epi-LASIK for myopia with astigmatism. The results of each surgery were compared with regard to visual acuity, spherical equivalent, safety, efficacy, stability, predictability and high order aberration. Results: Postoperative uncorrected visual acuities were 0.51 ± 0.11, 0.95 ± 0.08, and 0.97 ± 0.08 for epi-LASIK and 0.76 ± 0.19, 0.97 ± 0.07, and 0.98 ± 0.06 for femtosecond LASIK at one week, one month, and two months after surgery, respectively. Femtosecond LASIK showed faster improvement in visual acuity. Postoperative spherical equivalents were -0.83 ± 0.24, -0.31 ± 0.19, and -0.27 ± 0.09 for epi-LASIK and -0.47 ± 0.21, -0.28 ± 0.15, and -0.25 ± 0.12 for femtosecond LASIK. Safety, efficacy, stability, and predictability showed no differences between the two groups. High order aberrations were increased significantly; however, no significant difference between the two groups was found. Conclusions: Both epi-LASIK and femtosecond LASIK are effective for surgical correction of myopia with fast visual rehabilitation. In addition, epi-LASIK and femtosecond LASIK showed good safeties, efficacies, predictabilities, and stabilities. J Korean Ophthalmol Soc 2010;51(12):1573-1578

수술 전 안구계측치와 다초점 인공수정체의 유효 덧댐굴절력

이지영,황웅주 대한검안학회 2022 Annals of optometry and contact lens Vol.21 No.2

목적: 다초점 회절 인공수정체 삽입 후 근거리 초점 거리와 각막면에서의 유효 덧댐굴절력을 계산하고자 한다. 대상과 방법: 본 연구는 이론 연구로 설계되어 진행되었다. 각막 굴절력은 36에서 48디옵터 범위 내에 2디옵터 간격으로, 안축장은20 mm에서 30 mm 범위 내에 2 mm 간격으로 설정한 안구 모델을 이용한 모의 실험에서 정시 목표의 인공수정체 도수를 계산하고, 인공수정체 도수에 다초점 인공수정체의 덧댐굴절력을 더한 인공수정체의 총 도수에서 근거리 목표 디옵터를 계산하였다. 모의 실험은 AMO TECNIS ZMB00, ZLB00, ZKB00 세 가지 다초점 인공수정체를 이용하여 시행하였고, 인공수정체면의 덧댐굴절력은 +4.00, +3.25, +2.75디옵터였다. 결과: 수술 전 각막 곡률과 안축장이 증가할수록 유효 덧댐굴절력은 감소하였다. 각막 모양이 가파를수록 SRK/T 공식을 사용하여계산한 유효 덧댐굴절력이 가장 작았으며, 각막 모양이 편평할수록 Hoffer Q 공식을 사용하여 계산한 유효 덧댐굴절력이 가장 작았다. 결론: 유효 덧댐굴절력과 근거리 목표 초점 거리는 수술 전 안구계측치와 이론적 인공수정체 계산 공식에 따라 변화한다.

무수정체안에서 인공수정체공막고정술 및 홍채 후방고정 안내렌즈삽입술 비교

김주영,박창현,황웅주,나경선,김현승 대한안과학회 2019 대한안과학회지 Vol.60 No.7

Purpose: To compare the efficacy and complications of scleral fixation of posterior chamber intraocular lens (IOL) and retropupillary fixation of iris claw IOL for dislocated IOL or aphakia without sufficient capsular support. Methods: This retrospective study was comprised of 17 eyes of 16 patients undergoing scleral fixation and 14 eyes of 13 patients undergoing retropupillary fixation from August 2013 to June 2018. Uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), intraocular pressure (IOP), slit lamp examination, corneal topography, refractive indices, corneal curvatures, corneal endothelial cell density, and complications of both groups were examined preoperatively and 1 day, 1 week, 1 month, 2 months, and 6 months postoperatively. Results: Six months after the operation, UCVA and BCVA improved in both groups; however, there were no significant differences between the two groups (UCVA, p = 0.162; BCVA, p = 0.418). IOP was temporarily higher in the scleral fixation group at one day postoperatively (p = 0.023). The mean absolute prediction error was smaller in the retropupillary iris fixation group at 6 months postoperatively (p = 0.034). Postoperative total astigmatism, corneal astigmatism, and corneal endothelial cell density were not significantly different between the two groups. Conclusions: The retropupillary iris fixation group did not show significant improvement in visual acuity compared with the scleral fixation group. However, the retropupillary iris fixation group provided better mean absolute prediction error and a low risk of postoperative increase in IOP compared with the scleral fixation group. Retropupillary fixation of iris claw IOL is a promising option for scleral fixation of posterior chamber IOL for dislocated IOL or aphakia without sufficient capsular support. 목적: 본 연구는 탈구된 인공수정체안이나 무수정체안의 치료로서 인공수정체공막고정술과 홍채 후방고정 안내렌즈삽입술 사이의 임상 결과를 비교 분석하고자 한다. 대상과 방법: 본 후향적 연구는 2013년 8월에서 2018년 6월까지 인공수정체공막고정술을 시행받은 16명 17안과 홍채 후방고정 안내렌즈삽입술을 시행받은 13명 14안에 대하여 진행하였다. 수술 전과 수술 1일, 1주일, 1개월, 2개월, 6개월 후의 나안시력, 최대교정시력, 안압 등을 세극등현미경, 각막형태검사, 자동굴절검사 및 각막내피세포검사로 확인하여 그 결과 및 합병증을 비교하였다. 결과: 수술 6개월 후 나안시력과 최대교정시력은 두 군 모두 호전되었으나, 두 군 간에 유의한 차이를 보이지 않았으며(나안시력, p=0.162; 최대교정시력, p=0.418), 수술 1일 후 안압은 공막고정군에서 일시적으로 더 높았다(p=0.023). 수술 6개월 후 평균 절대예측오차는 홍채고정군에서 더 작았다(p=0.034). 수술 후 전체난시와 각막난시, 각막내피세포 밀도는 두 군에서 유의한 차이가 없었다. 결론: 홍채 후방고정 안내렌즈삽입술은 인공수정체공막고정술에 비해 유의한 시력 호전은 없었으나, 평균 절대예측오차가 더 작아서 수술 후 구면렌즈 대응치에 대한 예측도가 더 좋은 것으로 생각되며, 수술 후 안압상승을 덜 유발한다. 홍채 후방고정 안내렌즈삽입술은 탈구된 인공수정체안이나 무수정체안의 치료로서 공막고정술의 유효한 대안이 될 수 있다.

백내장수술 후 마이봄샘 기능부전과 눈물 지질층 분석

오주현,박창현,황웅주,나경선,김현승 대한안과학회 2019 대한안과학회지 Vol.60 No.6

Purpose: We report the clinical manifestations of dry eye syndrome after cataract surgery involving meibomian gland structure, meibomian gland function, and tear lipid layer analysis. Methods: The clinical manifestations of dry eye syndrome were retrospectively evaluated in 34 eyes of 31 patients who underwent cataract surgery from September to November 2017. The ocular surface disease index (OSDI), tear break-up time (tBUT), Oxford stain score, presence or absence of blepharitis, and meibomian gland expression were measured preoperatively and at 1 week, 1 month, and 2 months postoperatively. Lipid layer thickness (LLT), partial blinks, and meibomian gland images were measured using LipiView® (TearScience, Morrisville, NC, USA), an interferometric eye surface measuring device. Results: The postoperative OSDI was significantly higher than preoperative OSDI (17.09 ± 1.81): 22.76 ± 1.99 at 1 week, 23.12 ± 1.91 at 1 month, and 22.68 ± 1.92 at 2 months (p < 0.05). The postoperative tBUT was significantly lower than preoperative tBUT (5.07 ± 0.39): 3.99 ± 0.31 at 1 week, 3.49 ± 0.27 at 1 month, and 4.72 ± 0.39 at 2 months (p < 0.05). The Oxford staining score increased after surgery, but the difference was not statistically significant. Postoperative meibomian gland expression was significantly lower preoperative values (4.9 ± 2.8): 4.4 ± 2.8 at 1 month, and 3.9 ± 2.8 at 2 months (p < 0.05). The LLT decreased at 1 month postoperatively and increased at 2 months postoperatively, but these differences were not statistically significant. Conclusions: Cataract surgery resulted in a short-term meibomian gland dysfunction, leading to deterioration of dry eye after cataract surgery. However, we could not confirm structural changes in the meibomian gland, so it will be necessary to observe the clinical features of dry eye syndrome over a longer period of time. 목적: 마이봄샘의 구조, 기능 및 눈물 지질층 분석을 통해 백내장수술 후 발생하는 안구건조증의 임상양상에 대하여 보고하고자 한다. 대상과 방법: 2017년 9월부터 11월까지 백내장수술을 받은 34안(31명)을 대상으로 후향적으로 안구건조증의 임상양상을 분석하였다. 수술 전, 수술 후 1주, 1개월, 2개월에 안구표면질환지수, 눈물막파괴시간, 안구표면염색점수, 안검염, 마이봄샘 배출 평가를 시행하였다. 간섭을 이용한 안구표면측정장치로 눈물 지질층 두께, 부분 눈꺼풀 깜빡임, 마이봄샘을 촬영하여 분석하였다. 결과: 안구표면질환지수는 수술 전 17.09 ± 1.81, 1주 22.76 ± 1.99, 1개월 23.12 ± 1.91, 2개월 22.68 ± 1.92로 수술 전보다 유의하게 증가하였다(p<0.05). 눈물막파괴시간검사는 수술 전 5.07 ± 0.39, 1주 3.99 ± 0.31, 1개월 3.49 ± 0.27, 2개월 4.72 ± 0.39로 유의하게 감소하였다(p<0.05). 안구표면염색점수는 수술 후 증가하는 양상이었으나 유의한 차이는 없었다. 마이봄샘 배출력은 수술 전 4.9 ± 2.8, 1개월 4.4 ± 2.8, 2개월 3.9 ± 2.8로 유의하게 감소되었다(p<0.05). 눈물 지질층 두께는 유의한 차이는 없었다. 결론: 이 연구는 백내장수술이 단기적으로 마이봄샘 기능 저하를 일으켜 백내장수술 후 안구건조증이 악화된다는 것을 보여주었다. 하지만 유의한 마이봄샘의 구조적인 변화 양상은 확인할 수 없어 안구건조증의 임상양상에 대한 장기적 경과관찰이 필요할 것이다.

2001년 춘계 폐기물 관련학회 공동학술대회 논문집 제1집: 규산질다공체(CellCaSi)의 반복사용을 통한 퇴비화 거동특성

신항식,김현우,한선기,황웅주,최룡 한국폐기물자원순환학회(구 한국폐기물학회) 2000 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2001 No.1